Grinding-machine.



No. 645,382. Patented Mar. I3, I900. 8. BROWN.

GRINDING MACHINE.

(Applied-flan filed Nov. 9, 1899.)

2 Sheets-Sheet I,

(No Modal.)

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No. 645.382. Patented Mar. l3, I900. s. snow".

GRINDING MACHINE.

Application filed Nov. 9, 1899.) (No Modal.) 2 Sheets-Shoal 2.

absolutely dull that bad work results.

NITED STATES PATENT OFFICE.

SAMUEL BROWN, OF PHILADELPHIA, PENNSYLVANIA.

GRINDING-.MACHINE.

SPEOTFICATION forming part of Letters Patent No. 645,382, dated March13, 1900.

Application filed November 9, 1899. Serial No. 736,337. (No model.)

To aZZ whom it may concern:

Be it known that I, SAMUEL BROWN, of the city and county ofPhiladelphia, in the State of Pennsylvania, have invented an Improve:ment in Grinding-Machines, of which the following is a specification.

My invention has reference to portable grinding-machines and it consistsof certain improvements set out in the following specification and shownin the accompanying drawings, whichform a part thereof.

My invention has particular reference to a construction of machineadapted for sharpening blades of paper-cutting machines, and is so madethat the blades may be sharpened without removing them from the machine.The advantage of being able to sharpen the beveled cutter-blades ofpaper-cutting and similar machines without dismantling them isthreefold-namely, great loss of time is avoided, the machine is notrequired to be put into an inoperative condition, and thus impede theprogress of the work, and the blade may be kept constantly in a verysharp condition, and thereby insure the paper-cutting machine alwaysbeing in a form to do good work. Where a machine has to be'dismantledand the blade taken 06 and sharpened, it is usually the case that thesharpening is not resorted to until the machine becomes so This troubleis entirely avoided by use of my improved knife sharpening device, asthe same may be quickly and easily employed to sharpen the blade of thepaper-cuttingmachinethe moment there is any indication that it requiresattention. There is no loss of time beyond a few minutes at most. Forthis reason the blades of such machines will be constantly kept in thebest possible condition for the work for which they are designed.

In carrying out my invention I provide a suitable frame adapted to bereadily moved over the surface of the table of the paper-cutting machineunder the application of handpressure, and to this frame I adapt one ormore rotary grinding wheels or disks, preferably of emery, and impartthereto a rotation by a suitable crank or hand-power device. Ifurthermore prefer to arrange the grinding wheels or disks in a frame insuch a manner that they may be adjusted to change the obliquity of theirgrinding-surface to suit the obliquity of the 'bevels on differentcuttingblades.

Myimproveinents will be better understood by reference to theaccompanying drawings, in which-- Figure 1 is a side elevation of myimproved grinding-machine. Fig. 2 is a sectional elevationof same online 2 2 of Fig. Fig. 3 is a sectional elevation of same on line 3 3 ofFig. 2, and Fig. 4 is a sectional plan view of same on line 4. 4..

A is the main frame and is supported in'an upright position from a pairof base-plates B B, to which it is hinged by the transverse bolts 0. Thebase-plates B are provided on the under side with ball-casters b, whichare held in position by suitable retaining-plates B. By this means themachine is supported in a suitable manner upon four balls and may bemoved in any manner desired under the pressure of the hand, permittingthe smallest adjustments which might be necessary and also enabling themachine to be freely moved over the table of the paper-cutting machineto follow the edge of the cutting-blade which is being ground. Pivotedalso upon the bolts 0 is a frame D, extending obliquely forward andprovided with three bearings for receiving the shafts E E E. The shaftsE E are provided with heads (2, upon which are fitted the grinding disksor cups F, which are preferably clamped by means of retaining-plates Fand screwsf. I do not confine myself to any particular shape of grindingwheels or disks, but prefer the construction shown, as they are found inpractice to be excellently adapted for the purpose for which theinvention is intended. Ball-bearings G are interposed between the heads6 and the fiat surface d of the frame D. These ball-bearings G arereceived in V-shaped annular grooves and receive the thrust put upon thegrinding-disks by the cutter-blades. The rear ends of the shafts E arefitted with spur-gears M, which are held to the shafts by means ofset-screws S. Journaled upon the intermediate shaft Eand meshing withthe two spurwheels M M is an intermediate pinion L, which is preferablyformed integral with the driving-pinion K. The driving-pinion K mesheswith a gear J, secured to the rearwardly-extending shaft H, terminatingin a crank-handle 7a. The hub of the gear J is 2 erases journaled in theframe A and in a rear frame I, as clearly shown in Fig. 2, though I donot confine myself to this means of journaling it. The gears J and K arepreferably somewhat conical or beveled to permit the more readyadjustment of the frame D about 0 as accuter while maintaining the twogears J and K in mesh.

The frame D is provided with a transverse pin D, through which an adjusting-screw D passes, the upper end of the adj usting-sorew beingjournaled in a transverse block D loosely journaled in the upper end ofthe frame A. The extreme upper end of the shaft D is fitted with amilled head D whereby to turn it for properly adjusting the frame Dupward or downward to change the obliquity of the grinding-face of theemery-disks F to suit the obliquity of the cutting edge of the knife Rof the paper-cutter, as indicated in Fig. l.

T is an upper handle structure bolted to the main frame A and providesmeans for holding the tool by one handle while rotating the crank withthe other. By this means the tool may be shifted along the table,adjusting itself to the knife, while the crank h is being rotated.

In some cases where it is desirable only to rotate one of thegrinding-disksas, for instance, where the extreme end of thecuttingblade is being ground the set-screw S of the shaft of the othergrinding-disks may be loosened, so that the rotation of the crank willonly cause one of the grinding-disks to rotate, while the other acts' asa guide.

It is evident that, if desired, the frame A may be rigid with thefoot-plates B 3 but by making it adjustable, as shown, it is evidentthat a greater possible capacity of adjustment can be given to the disksF than if the screw D alone were relied upon for moving the frame D uponthe foot-plates B. By the construction shown the main frame A maybeadjusted backward or forward from a vertical position and carry with itthe frame D and then secure any additional adjustment of the frameD bymeans of the adjusting-screw D as before.

While I prefer the construction shown as being well adapted for thepurpose of the invention, I do not confine myself to the minor details,as these maybe varied in many Ways.

without departing from the principles of the invention.

Having now described my invention, what I claim as new, and desire tosecure by Letters Patent, is- 1. Ina portable grinding-machine, thecombination of a main frame provided with universally-movablesupporting-bearings therefor, one or more obliquely-arrangedgrindingdisks journaled in supports carried by said main frame, andhand-operating means for rotating the said disks.

2. In a portable grindingmachine, the combination of a main frameprovided with universally-movable supporting-bearings therefor, one ormore obliquely-arranged grinding disks journaled in adjustable supportscarried by said main frame, means for adjusting the adjustable supportsrelatively to the main frame, and hand-operated means for rotating thesaid disks.

3. In a portable grinding-machine, the combination of a movable mainframe, an adjustable frame pivoted to the main frame, means to adjustthe adjustable frame upon the main frame, one or more grinding-disksjournaled in the adjustable frame, and hand-power de vices for rotatingsaid disks.

4. In a portable grinding-machine, the com bination of a movable mainframe, an adjustable frame pivoted to the main frame, means to adjustthe adjustable frame upon the main frame, one or more grinding-disksjournaled in the adjustable frame, hand-power devices forrrotating saiddisks journaled in the main frame, and gearing between the hand-powerdevices on the main frame and the grindingdisks on the adjustable frame.

5. In a portable grinding machine, the combination of a main frameprovided with ad- 3' ustable supporting base-plates or feet,- one ormore obliquely-arranged grinding-disks carried by and adjustable withthe main frame upon the base-plates or feet, and means on the main framefor rotating the grinding-disks in all portions of adjustment relativelyto the base-plates or feet. 1

6. In a portable grinding-machine, the combination of base-plates orfeet, a movable main frame pivoted to the base-plates, an ad- 'justablcframe pivoted relatively to the main frame, means to adjust theadjustable frame relatively to the main frame connecting the saidframes, one or more grinding-disks j ournaled in the adjustablev frame,hand-power devicesfor rotating said disks.

7. In a portable grinding-machine, the combination of a main frameprovided with universally-movable supporting-bearings therefor and alsoprovided with handles wherewith to move it, one or moreobliquely-arranged grinding-disks journaled in supports carried by saidmain frame, means to adjust the grinding-disks, and hand-operated meansfor rotatingthe saiddisks.

8. In a portable grinding-machine, the combination of a main framehaving a supporting base structure, a frame pivoted relatively to themain frame, one or more grinding-disks journaled in the pivoted frame, acrank or main frame, gearing between the crank and the grinding-disks,and an adj usting-screw for adjusting the pivoted frame relatively tothe main frame without interfering with the gearing.

In testimony of which invention I have hereunto set my hand.

SAMUEL BROWN.

Witnesses:

ERNEs'r HOWARD HUNTER, J. W. KENWORTHY.

